﻿using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.IO;
 using System.Diagnostics;
 using ICSharpCode.SharpZipLib;
 using ICSharpCode.SharpZipLib.Zip;
 using ICSharpCode.SharpZipLib.Checksums;
 using ICSharpCode.SharpZipLib.Core;
namespace NCRE学生考试端V1._0
 {
     public class ZipHelper
     {
         /// <summary>
         /// 压缩文件
         /// </summary>
         /// <param name="sourceFilePath"></param>
         /// <param name="destinationZipFilePath"></param>
         public static void CreateZip(string sourceFilePath, string destinationZipFilePath)
         {
             if (sourceFilePath[sourceFilePath.Length - 1] != System.IO.Path.DirectorySeparatorChar)
                 sourceFilePath += System.IO.Path.DirectorySeparatorChar;
             ZipOutputStream zipStream = new ZipOutputStream(File.Create(destinationZipFilePath));
             zipStream.SetLevel(6);  // 压缩级别 0-9
             CreateZipFiles(sourceFilePath, zipStream);
             zipStream.Finish();
             zipStream.Close();
         }
         /// <summary>
         /// 递归压缩文件
         /// </summary>
         /// <param name="sourceFilePath">待压缩的文件或文件夹路径</param>
         /// <param name="zipStream">打包结果的zip文件路径（类似 D:\WorkSpace\a.zip）,全路径包括文件名和.zip扩展名</param>
         /// <param name="staticFile"></param>
         private static void CreateZipFiles(string sourceFilePath, ZipOutputStream zipStream)
         {
             Crc32 crc = new Crc32();
             string[] filesArray = Directory.GetFileSystemEntries(sourceFilePath);
             foreach (string file in filesArray)
             {
                 if (Directory.Exists(file))                     //如果当前是文件夹，递归
                 {
                     CreateZipFiles(file, zipStream);
                 }
                 else                                            //如果是文件，开始压缩
                 {
                     FileStream fileStream = File.OpenRead(file);
                     byte[] buffer = new byte[fileStream.Length];
                     fileStream.Read(buffer, 0, buffer.Length);
                     string tempFile = file.Substring(sourceFilePath.LastIndexOf("\\") + 1);
                     ZipEntry entry = new ZipEntry(tempFile);
                     entry.DateTime = DateTime.Now;
                     entry.Size = fileStream.Length;
                     fileStream.Close();
                     crc.Reset();
                     crc.Update(buffer);
                     entry.Crc = crc.Value;
                     zipStream.PutNextEntry(entry);
                     zipStream.Write(buffer, 0, buffer.Length);
                 }
             }
         }
     }
 }
